United Airlines Boeing 747-400

United Airlines Boeing 747-422, N172UA, is shown at Melbourne, Australia on November 7, 1989 wearing the carrier’s 1974-introduced livery with updated enlarged name titles.

(Photo credit: George Canciani)

United Airlines Boeing 747-422, N199UA, is shown departing Los Angeles in January 2006 wearing the carrier’s 1993-introduced livery.

(Photo credit: Danny Fritsche)

United Airlines Boeing 747-422, N199UA, is shown departing San Francisco on December 26, 2010 wearing the carrier’s 2004-introduced livery.

(Photo credit: Ben Wang)